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MDEV-26131 SEGV in ha_innobase::discard_or_import_tablespace

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Import operation without .cfg file fails when there is mismatch of index
between metadata table and .ibd file. Moreover, MDEV-19022 shows
that InnoDB can end up with index tree where non-leaf page has only
one child page. So it is unsafe to find the secondary index root page.

This patch does the following when importing the table without .cfg file:

1) If the metadata contains more than one index then InnoDB stops
the import operation and report the user to drop all secondary
indexes before doing import operation.

2) When the metadata contain only clustered index then InnoDB finds the
index id by reading page 0 & page 3 instead of traversing the
whole tablespace.
This commit is contained in:
Thirunarayanan Balathandayuthapani
2021-07-28 19:25:25 +05:30
parent 4cd063b9e4
commit 89445b64fe
6 changed files with 249 additions and 115 deletions
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22
mysql-test/suite/encryption/r/innodb_import.result Normal file
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#
# MDEV-26131 SEGV in ha_innobase::discard_or_import_tablespace
#
CREATE TABLE t1(f1 int,f2 text)ENGINE=InnoDB;
INSERT INTO t1 VALUES(1, "InnoDB");
CREATE TABLE t2 LIKE t1;
ALTER TABLE t2 ADD KEY idx (f2(13));
ALTER TABLE t2 DISCARD TABLESPACE;
FLUSH TABLES t1 FOR EXPORT;
UNLOCK TABLES;
ALTER TABLE t2 IMPORT TABLESPACE;
ERROR HY000: Internal error: Drop all secondary indexes before importing table test/t2 when .cfg file is missing.
ALTER TABLE t2 DROP KEY idx;
Warnings:
Warning 1814 Tablespace has been discarded for table `t2`
ALTER TABLE t2 IMPORT TABLESPACE;
Warnings:
Warning 1810 IO Read error: (2, No such file or directory) Error opening './test/t2.cfg', will attempt to import without schema verification
SELECT * FROM t2;
f1 f2
1 InnoDB
DROP TABLE t1, t2;

7
mysql-test/suite/encryption/t/innodb_import.combinations Normal file
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[page_compressed]
innodb-compression-default=1
[encryption]
innodb-encrypt-tables=1
[page_compressed_encryption]
innodb-compression-default=1
innodb-encrypt-tables=1

21
mysql-test/suite/encryption/t/innodb_import.test Normal file
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--source include/have_innodb.inc
-- source include/have_example_key_management_plugin.inc
--echo #
--echo # MDEV-26131 SEGV in ha_innobase::discard_or_import_tablespace
--echo #
let $MYSQLD_DATADIR = `SELECT @@datadir`;
CREATE TABLE t1(f1 int,f2 text)ENGINE=InnoDB;
INSERT INTO t1 VALUES(1, "InnoDB");
CREATE TABLE t2 LIKE t1;
ALTER TABLE t2 ADD KEY idx (f2(13));
ALTER TABLE t2 DISCARD TABLESPACE;
FLUSH TABLES t1 FOR EXPORT;
--copy_file $MYSQLD_DATADIR/test/t1.ibd $MYSQLD_DATADIR/test/t2.ibd
UNLOCK TABLES;
--error ER_INTERNAL_ERROR
ALTER TABLE t2 IMPORT TABLESPACE;
ALTER TABLE t2 DROP KEY idx;
ALTER TABLE t2 IMPORT TABLESPACE;
SELECT * FROM t2;
DROP TABLE t1, t2;